نتایج جستجو برای: surface stabilization

تعداد نتایج: 683280  

2015
R. Guglielmi

We prove a sharp decay rate for the total energy of two classes of systems of weakly coupled hyperbolic equations. We show that we can stabilize the full system through a single damping term, acting on one component only of the system (indirect stabilization). The energy estimate is achieved by means of suitable estimates of the resolvent operator norm. We apply this technique to a system of wa...

2015
Patrick Duchstein Theodor Milek Dirk Zahn

Molecular models of 5 nm sized ZnO/Zn(OH)2 core-shell nanoparticles in ethanolic solution were derived as scale-up models (based on an earlier model created from ion-by-ion aggregation and self-organization) and subjected to mechanistic analyses of surface stabilization by block-copolymers. The latter comprise a poly-methacrylate chain accounting for strong surfactant association to the nanopar...

2014
Yuki Noda Shin-ichiro Noro Tomoyuki Akutagawa Takayoshi Nakamura

Gold nanoparticle assemblies possess diverse application potential, ranging from industrial nanotechnology to medical biotechnology. Because the structures and properties of assemblies are directly affected by the stabilization mechanism between the organic molecules serving as protecting ligands and the gold nanoparticle surface, it is crucial to find and investigate new stabilization mechanis...

2008
BY SAMBIT MISRA HARRY DANKOWICZ MARK R. PAUL

This paper presents an event-driven, discrete-in-time feedback strategy for tracking and stabilizing naturally occurring periodic oscillations in the probe-tip dynamics of atomic force microscope (AFM) cantilevers in tapping-mode operation. Specifically, robust dynamic tracking and stabilization is achieved by the imposition of discrete changes in the vertical offset between the cantilever supp...

2015
Andreas Orthaber Henrik Löfås Elisabet Öberg Anton Grigoriev Andreas Wallner S Hassan M Jafri Marie-Pierre Santoni Rajeev Ahuja Klaus Leifer Henrik Ottosson Sascha Ott

Acetylenic phosphaalkenes (APAs) are used as a novel type of ligands for the stabilization of gold nanoparticles (AuNP). As demonstrated by a variety of experimental and analytical methods, both structural features of the APA, that is, the P=C as well as the C≡C units are essential for NP stabilization. The presence of intact APAs on the AuNP is demonstrated by surface-enhanced Raman spectrosco...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2004
K Ueno

Wavy pattern of ice with a specific wavelength occurs during ice growth from a thin layer of undercooled water flowing down the surface of icicles or inclined plane. In a previous paper [Phys. Rev. E 68, 021603 (2003)]], we have found that restoring forces due to gravity and surface tension is a factor for stabilization of morphological instability of the solid-liquid interface. However, the me...

Journal: :J. Comput. Physics 2017
Roger A. Sauer Thang X. Duong Kranthi K. Mandadapu David J. Steigmann

This paper presents a new finite element (FE) formulation for liquid shells that is based on an explicit, 3D surface discretization using C1-continuous finite elements constructed from NURBS interpolation. Both displacement-based and mixed FE formulations are proposed. The latter is needed for area-incompressible material behavior, where penalty-type regularizations can lead to misleading resul...

Instabilities of a thin viscous film flowing down a uniformly heated plane are investigated in this study. The heating generates a surface tension gradient that induces thermocapillary stresses on the free surface. Thus, the film is not only influenced by gravity and mean surface tension but also the thermocapillary force is acting on the free surface. Moreover, the heat transfer at the free su...

Journal: :iranian biomedical journal 0
maurice george ekpenyong environmental microbiology and biotechnology unit, department of microbiology, faculty of biological sciences, university of calabar, p.m.b.1115 calabar, nigeria sylvester peter antai environmental microbiology and biotechnology unit, department of microbiology, faculty of biological sciences, university of calabar, p.m.b.1115 calabar, nigeria atim david asitok environmental microbiology and biotechnology unit, department of microbiology, faculty of biological sciences, university of calabar, p.m.b.1115 calabar, nigeria bassey offiong ekpo exploration, research and services section, research and development (r&d) division, nigerian national petroleum corporation (nnpc), port-harcourt, nigeria

background: a glycolipopeptide biosurfactant produced by pseudomonas aeruginosa strain ikw1 reduced the surface tension of fermentation broth from 71.31 to 24.62 dynes/cm at a critical micelle concentration of 20.80 mg/l. the compound proved suitable for applications in emulsion stabilization in food, as well as in cosmetic and pharmaceutical formulations. methods: in the present study, placket...

Journal: :physical chemistry research 2014
s. hosien mousavipour shapour ramazani fatemeh pirhadi

qct calculations were performed to study the behavior of energized nh2oh formed by association collision of nh2 radical with oh radical. a potential energy surface that describes the behavior of the title reaction has been constructed by interpolation of ab initio data. h2o, hon, hno, nh3, o, h2no, cis or trans-honh, and h products and two vibrationally energized nh2oh and nh3o adducts were obs...

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